JPH10138259A - Unvulcanized rubber heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently heat damping members of various sizes by using one induction coil. SOLUTION: An induction heating plate 15 and a rubber member 14 are arranged to the inner periphery of an induction coil 17 formed into an annular shape and the induction heating plate 15 is subjected to electromagnetic induction heating by the magnetic field due to the induction coil 17 to heat the rubber member 14. A magnetic field transfer apparatus 18 formed so as to have an open end at the position approaching the rubber member 14 while surrounding the induction coil 17 from the outer periphery thereof to the inner periphery thereof and collecting the magnetic field generated around the induction coil 17 without generating an eddy current to generate the same from an open end is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unvulcanized rubber heating device for heating unvulcanized rubber using electromagnetic induction heating.

[0002]

2. Description of the Related Art In general, a vulcanized rubber molded product used for a tire or a vibration isolating member is heated with steam or the like so that a crosslinked rubber structure is formed after an unvulcanized rubber is charged in a mold. Vulcanization molding is performed by heating with a medium. In recent years, vulcanization molding by electromagnetic induction heating, which can heat unvulcanized rubber with high efficiency, has attracted attention.

In the conventional vulcanization molding by electromagnetic induction heating, a mold is formed from a magnetic material such as iron, and an annular induction coil is arranged around the mold (see FIG. 2). After loading the rubber, a high frequency alternating current is applied to the induction coil to generate a magnetic field around the mold. Then, by generating an eddy current in the mold by this magnetic field and heating the mold, the unvulcanized rubber in the mold is heated, and the unvulcanized rubber is vulcanized and formed only by heating by this electromagnetic induction heating, Alternatively, vulcanization molding is performed by heating with a heating medium such as steam.

[0004]

However, in the above-mentioned conventional structure, in order to reduce the equipment cost and the like, if it is attempted to manufacture vulcanized rubber molded products of various sizes using one induction coil, vulcanized rubber products of a small size are required. There is a problem that the heating efficiency is reduced when manufacturing a vulcanized rubber molded product.

In other words, the annular induction coil is arranged around the mold, and if it is intended to cope with vulcanized rubber molded products of various sizes, it is necessary to set the diameter to a value corresponding to the maximum diameter mold. However, in the electromagnetic induction heating, the heating efficiency increases and decreases in proportion to the magnetic flux density of the magnetic field generated by the induction coil, and the magnetic flux density has a property of decreasing as the distance from the induction coil increases. Therefore,
In the case of vulcanization molding using a mold with the largest diameter, the mold is close to the induction coil, so high heating efficiency can be obtained with a large magnetic flux density, but vulcanization molding using a small diameter mold In this case, since the mold is separated from the induction coil, the heating efficiency is reduced due to the decrease in the magnetic flux density. As a result, the conventional configuration cannot efficiently heat the unvulcanized rubber when producing a vulcanized rubber molded product having a small size.

Accordingly, an object of the present invention is to provide an unvulcanized rubber heating device capable of efficiently manufacturing vulcanized rubber molded products of various sizes by using one induction coil.

[0007]

In order to solve the above-mentioned problems, an invention according to claim 1 is to arrange an induction heating body and an unvulcanized rubber on the inner peripheral side of an induction coil formed in a ring shape. In an unvulcanized rubber heating device that heats the unvulcanized rubber by heating the heating body by electromagnetic induction using a magnetic field generated by the induction coil, at least a part of the induction coil is surrounded from the outer side to the inner side. A magnetic field transfer unit formed so as to have an open end at a position close to the induction heating body, and to collect a magnetic field generated around the induction coil without generating an eddy current and generate the magnetic field from the open end; It is characterized by. As a result, the magnetic field transfer means collects the magnetic field generated around the induction coil and generates the magnetic field from the open end close to the induction heating body. Therefore, even if the induction coil is separated from the induction heating body, the induction heating is performed. The body will be inductively heated by the strong magnetic field. Therefore, even if the size of the induction heating body is changed in accordance with the size of the unvulcanized rubber so as to heat unvulcanized rubber of various sizes, a strong magnetic field is always applied to the induction heating body by the magnetic field transfer means. Since electromagnetic induction heating can be performed by applying the voltage, unvulcanized rubber of various sizes can be efficiently heated.

According to a second aspect of the present invention, there is provided the unvulcanized rubber heating apparatus according to the first aspect, wherein the magnetic field transfer means includes a laminated member formed by laminating silicon steel plates, and each of the silicon steel plates is arranged in a magnetic field direction. Is provided so as to be parallel to. Thereby, since the laminated member can be formed using a silicon steel plate, which is a general material, a magnetic field transfer unit can be easily obtained. Then, the magnetic field generated by the induction coil can be efficiently collected and generated from the open end.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the unvulcanized rubber heating device according to the present embodiment includes a pressing device 10 for vertically pressing a vibration isolating member 12 loaded in a mold 13, and a vibration isolating member 12. And an electromagnetic induction heating device 11 for heating the heat. The pressurizing device 10 has a frame type frame 1 whose inside is opened. The frame type frame 1 is formed by stacking a plurality of frame plates 2 and fastening them with bolts 3. By adjusting the number of stacked frame plates 2, a desired amount of stress or strain can be reduced. It can be easily obtained.

As shown in FIG. 1, a spacer member 4 is provided on the upper surface of the inside of the frame type frame 1.
An upper platen 6 is provided at a lower end of the spacer member 4 via a platen support 5. Below the upper platen 6, a lower platen 7 having a hollow portion 7a is disposed similarly to the upper platen 6. Then, the hollow portions 6a, 7a of these upper and lower platens 6, 7
Is connected to a heat supply source (not shown). The heat supply source heats the upper and lower platens 6.7 above a predetermined temperature by supplying a heating medium such as steam to the hollow portions 6a. It is made to let.

The lower platen 7 is provided with a pressurizing cylinder 9 using a fluid pressure such as a hydraulic pressure via a platen support 8.
It is supported by. The pressurizing cylinder 9 has a pressurizing rod 9a whose axis is set in the vertical direction, and moves the pressurizing rod 9a forward and backward to raise and lower the lower platen 7. These upper platens 6
The mold 13 and the vibration isolating member 12 are carried in between the lower platen 7 and the lower platen 7. Mold 1
Numeral 3 is integrally formed in a cylindrical shape so as to contact the side peripheral surface of the vibration isolating member 12. A hollow portion 13a is formed in the mold 13, and the above-described heat supply source (not shown) is connected to the hollow portion 13a during vulcanization molding. Thereby, the mold 13
Is heated to a predetermined temperature or higher by supplying a heating medium such as steam from the heat supply source to the hollow portion 13a. Further, the mold 13 is formed using a non-magnetic material such as SUS304 so that a magnetic field can be satisfactorily generated in the mold 13. still,
The mold 13 may be a semi-circular or arc-shaped split mold divided into a plurality of pieces, or may be formed so as to completely cover the entire vibration isolating member 12.

The vibration isolating member 12 loaded in the mold 13 has a cylindrical rubber body 14 made of unvulcanized rubber. Inside the rubber body 14, induction heating plates 15 made of a magnetic material such as an iron plate are horizontally arranged while being vertically stacked at predetermined intervals. Also, the rubber body 14
Flange plates 16a and 16b made of a magnetic material are joined to the upper and lower surfaces of the
These flange plates 16a and 16b and induction heating plate 1
Are heated by electromagnetic induction to heat the rubber body 14 from above and below and from the inside.

The vibration isolating member 12 may have a configuration in which the induction heating plate 15 is completely buried in the rubber body 14, or a part or all of the side peripheral surface of the induction heating plate 15 may be the rubber body 14. It may be a configuration that is exposed from. If the induction heating plates 15 are completely embedded in the rubber body 14,
By one vulcanization molding, the induction heating plates 15 can be formed into a vulcanized rubber molded product with sufficient rust prevention. On the other hand, if part or all of the side peripheral surface of the induction heating plate 15 is exposed from the rubber body 14, the rubber body 14 is more efficiently heated via the induction heating plate 15 abutting on the mold 13. In addition, the cooling can be efficiently performed by radiating the heat through the induction heating plates 15 at the time of cooling.

The heating of the induction heating plates 15 and the flange plates 16a and 16b is performed by an electromagnetic induction heating device 11 disposed around a mold 13, as shown in FIG. Electromagnetic induction heating device 11
Has an annular induction coil 17, a cooling device (not shown) for forcibly cooling the induction coil 17 with air or water, and six magnetic field transfer devices 18 uniformly arranged in the outer circumferential direction from the induction coil 17. I have. An AC generator (not shown) is connected to the induction coil 17.
An alternating current is applied to the induction coil 17 at an arbitrary frequency from a low frequency of less than Hz to a high frequency of several tens of kHz, and a magnetic field of an arbitrary strength is generated around the induction coil 17.

On the other hand, as shown in FIG. 3, the magnetic field transfer device 18 arranged in the outer circumferential direction of the induction coil 17
9 and a lamination member 20, and the lamination member 20 can move forward and backward in the direction of the mold 13. The laminated member 20 is formed by laminating silicon steel plates 21 formed in a U-shape and having a thickness of about 0.1 mm while joining them with a resin, and includes an upper surface portion 20a, a lower surface portion 20b, and both these portions. And a connecting portion 20c for connecting 20a and 20b. The laminated member 20 is set so that the surface of each silicon steel plate 21 is parallel to the direction of the magnetic field, and the induction coil 1 is disposed between the upper surface 20a and the lower surface 20b.
7 is set so that the open ends of both portions 20a and 20b are located on the inner peripheral side of the induction coil 17 (in the direction of the mold 13). Thereby, the laminated member 20
By surrounding the induction coil 17 from the outer peripheral side to the inner peripheral side, the magnetic field generated around the induction coil 17 is collected without generating eddy currents in the respective parts 20a to 20c, and the open ends of the upper surface part 20a and the lower surface part 20b are collected. And a strong magnetic field is generated at a position close to the mold 13. The laminated member 20
It is desirable that the distance between the open ends of the upper surface portion 20a and the lower surface portion 20b be set to a distance substantially equal to the height of the vibration isolation member 12.

The induction coil 17 for generating a magnetic field as described above is supported by a pair of left and right support rails 22 as shown in FIG. A transfer mechanism 23 for moving the mold 13 while supporting it is provided between the support rails 22. The support rails 22 and the transfer mechanism 23 are provided between the pressure device 10 and the periphery of the mold 13. And a coil attaching / detaching device 24 for setting the induction coil 17 to the coil. And
The transfer device 23 and the support rails 22 carry the guide coil 17 and the mold 13 in and out of the pressurizing device 10 in a constant form by moving the mold 13 and the guide coil 17 at a constant speed. It has become.

Each device such as the magnetic field transfer device 18 and the pressurizing device 10 is connected to a control device (not shown). The control device controls the heating pattern (the amount of current to the induction coil 17, the current frequency, the steam temperature, etc.) corresponding to the specifications of the vibration isolator 12, and the size (mold diameter, mold diameter) of the mold 13 into which the vibration isolator 12 is loaded. Various kinds of heating information data such as height) are stored. Then, the control device controls the vibration isolating member 1.
When the product data of No. 2 is input, the amount of advance of the laminated member 20 and the heating pattern are obtained based on the product data and the heating information data, and the vibration isolating member 12 is heated and vulcanized. Has become.

The operation of the unvulcanized rubber heating device in the above configuration will be described. In the following description,
Assuming that vulcanization molding is performed for a product having a constant height of the vibration isolating member 12 (mold 13), when the height of the vibration isolating member 12 (mold 13) is changed, the size (height) corresponding to this height is changed. The laminated member 20 of (a) is mounted on the support base 19 again.

First, when an operation power supply is turned on to a control device (not shown), an initial setting operation is performed to retreat the laminated member 20 to the last portion with respect to the magnetic field transfer device 18 and to attach the mold 13 to the coil attaching / detaching device. The magnetic field transfer device 18 located in the path of the transport mechanism 23 is lowered below the transport mechanism 23 so that the magnetic field transfer device 18 is carried into the pressure device 10 from 24. Further, the induction coil 17 is moved up to the uppermost retracted position with respect to the coil attaching / detaching device 24.

Next, when the type data of the vibration isolating member 12 to be vulcanized and formed is input to a controller (not shown), the controller compares the type data with the heating information data. Then, the amount of advance of the laminated member 20 is obtained from the mold diameter of the mold 13 used in the present vulcanization molding, and the heating pattern (the amount of current to the induction coil 17, the current frequency, the steam temperature, etc.) corresponding to the type data is obtained. Is read.

Then, after confirming that the mold 13 loaded with the vibration isolating member 12 has reached the coil attaching / detaching device 24 by a transfer device or the like, the induction coil 17 is lowered and placed on the support rails 22. By doing so, mold 1
The induction coil 17 is located around 3. When the setting of the induction coil 17 is completed, the mold 13 and the induction coil 17 are moved toward the pressurizing device 10 at a constant speed by operating the transport mechanism 23 and the support rail 22. When the mold 13 and the induction coil 17 reach the pressurizing device 10, the pressurizing rod 9a is advanced to the pressurizing cylinder 9 as shown in FIG. Platen 7
And it is pinched and pressed by the upper platen 6.

Further, after the magnetic field transfer device 18 existing in the path of the transport mechanism 23 is raised to the same height as the other magnetic field transfer devices 18, all the advance amounts are set so that the advance amounts obtained in advance are obtained. For the magnetic field transfer devices 18 ... the laminated members 20 ...
And the open ends of the laminated members 20 are brought close to the side peripheral surface of the mold 13.

Thereafter, a heating medium such as steam is supplied to the upper platen 6, the lower platen 7, and the mold 13 to heat the same, and an AC current is applied to the induction coil 17 at a predetermined frequency. A magnetic field is generated around the. At this time, as shown in FIG.
Are partially (six places) surrounded by six laminated members 20. Each laminated member 20 collects the magnetic field generated around the induction coil 17 in each of the portions 20 a to 20 c, and the upper surface portion 20 a And it is generated again from the open end of the lower surface portion 20b. Accordingly, a strong magnetic field is generated at a position close to the mold 13, and this magnetic field is generated with substantially the same strength in the internal vibration isolating member 12 because the mold 13 is formed of a non-magnetic material. .

As shown in FIG. 1, the magnetic field generated in the vibration isolating member 12 is embedded in the rubber members 14 and the flange plates 16a and 16b joined to the upper and lower surfaces of the rubber member 14 in the vibration isolating member 12. The induction heating plates 15 are heated by generating eddy currents. Then, this flange plate 16a · 1
By heating the rubber body 14 from above and below and from the inside by heating the heating body 6b and the induction heating plates 15, the rubber body 14 is further heated by the upper platen 6, the lower platen 7, and the mold 13 to promote the heating of the rubber body 14. 14 is externally and internally heated and vulcanized.

Thereafter, when the vulcanization forming of the vibration isolating member 12 is completed, the laminated member 20 is retracted with respect to the magnetic field transfer device 18 and the magnetic field transfer device 18 existing in the path of the transport mechanism 23 is lowered. Then, the mold 13 is carried out of the pressurizing device 10 together with the induction coil 17 and transferred to the coil attachment / detachment device 24. After the induction coil 17 is raised in the coil attachment / detachment device 24, the mold 13 is vulcanized. At the same time, it is transferred to the next step such as a cooling step.

As described above, the unvulcanized rubber heating device according to the present embodiment has the induction heating plate 15 (induction heating body) and the rubber body 14 (unvulcanized) on the inner peripheral side of the induction coil 17 formed in a ring shape. Rubber) is arranged, and the rubber body 14 is heated by electromagnetic induction heating of the induction heating plate 15 by a magnetic field generated by the induction coil 17. The rubber body 14 is surrounded from the outer peripheral side to the inner peripheral side of the induction coil 17. By having an open end at a position close to 14, an arrangement is provided with a magnetic field transfer device 18 (magnetic field transfer means) for collecting a magnetic field generated around the induction coil 17 and generating the magnetic field from the open end. ing.

Incidentally, the magnetic field transfer device 18 in the present embodiment
Is configured to surround a part of the induction coil 17 by forming the laminated member 20 to have a predetermined width, but the present invention is not limited to this, and the laminated member 20 may be formed in a ring shape or a semicircular shape. By forming, it may be configured to surround the entire circumference of the induction coil 17.

As a result, the magnetic field transfer device 18 collects the magnetic field generated around the induction coil 17 and
Since the magnetic field is generated from the open end close to the induction heating plate 15, even if the induction coil 17 and the induction heating plate 15 are separated from each other, the induction heating plate 15 is electromagnetically heated by the strong magnetic field. Therefore, even if the size of the induction heating plate 15 is changed in accordance with the size of the rubber body 14, the magnetic field transfer device 18 can apply a strong magnetic field to the induction heating plate 15 to perform electromagnetic induction heating. It is possible to efficiently heat the rubber body 14 having a suitable size.

Further, the magnetic field transfer device 1 according to the present embodiment
8 is a laminated member 20 formed by laminating silicon steel plates 21
In such a manner that each of the silicon steel plates 21 is parallel to the direction of the magnetic field. Thereby, the magnetic field transfer device 18 can be easily obtained by forming the laminated member 20 using the silicon steel plate 21 which is a general material. Then, the magnetic field generated by the induction coil 17 can be efficiently collected and generated from the open end.

The unvulcanized rubber heating device in the present embodiment is used for vulcanizing the vibration isolating member 12, but is not limited to this, and is used for vulcanizing a tire. The vibration-absorbing member 12 and the tire may be used for preheating before vulcanization molding. In addition, in applications where a tire having no induction heating plate 15 or the like is heated, it is desirable that the mold 13 is formed of a magnetic material and the mold 13 is heated by electromagnetic induction heating.

In the present embodiment, the laminated member 2
Although 0 is formed by the silicon steel plate 21, the present invention is not limited to this. For example, it can be formed by laminating plate materials such as an amorphous ribbon having a so-called amorphous structure. The surface of the silicon steel plate 21 is coated with an electrical insulating film such as a Si-based resin or Teflon in order to suppress eddy current.

[0032]

According to the first aspect of the present invention, an induction heating body and unvulcanized rubber are arranged on the inner peripheral side of an annular induction coil, and the induction heating body is electromagnetically heated by a magnetic field generated by the induction coil. By doing so, in the unvulcanized rubber heating device for heating the unvulcanized rubber, the open end at a position close to the induction heating body while surrounding at least a part of the induction coil from the outer peripheral side to the inner peripheral side And a magnetic field transfer means for collecting a magnetic field generated around the induction coil without generating an eddy current and generating the magnetic field from the open end. As a result, the magnetic field transfer means collects the magnetic field generated around the induction coil and generates the magnetic field from the open end close to the induction heating body. Therefore, even if the induction coil is separated from the induction heating body, the induction heating is performed. The body will be inductively heated by the strong magnetic field. Therefore, even if the size of the induction heating body is changed in order to heat various sizes of unvulcanized rubber, the induction heating body can always be electromagnetically heated by the strong magnetic field from the magnetic field transfer means. This has the effect that the vulcanized rubber can be efficiently heated.

According to a second aspect of the present invention, there is provided the unvulcanized rubber heating apparatus according to the first aspect, wherein the magnetic field transfer means comprises a laminated member formed by laminating silicon steel plates, and each of the silicon steel plates is arranged in a magnetic field direction. This is a configuration provided so as to be parallel to. Thereby, since the laminated member can be formed using a silicon steel plate, which is a general material, a magnetic field transfer unit can be easily obtained. Then, there is an effect that the magnetic field generated by the induction coil can be efficiently collected and generated from the open end.

[Brief description of the drawings]

FIG. 1 is a front view of an unvulcanized rubber heating device.

FIG. 2 is a plan view of an unvulcanized rubber heating device.

FIG. 3 is an explanatory diagram showing an operation state of the magnetic field transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame type frame 2 Frame plate 3 Bolt 4 Spacer member 5 Platen support 6 Upper platen 7 Lower platen 8 Platen support 9 Pressure cylinder 10 Pressure device 11 Electromagnetic induction heating device 12 Vibration isolation member 13 Mold 14 Rubber body 15 Induction heating plate 16a / 16b Flange plate 17 Induction coil 18 Magnetic field transfer device 19 Support base 20 Laminated member 21 Silicon steel plate 22 Support rail 23 Transport mechanism 24 Coil attaching / detaching device

Continuing on the front page (72) Inventor Natsushiro Ureshino 2-3-1, Shinhama, Arai-machi, Takasago-shi, Hyogo Pref. Inside Kobe Steel, Ltd. Takasago Works (72) Inventor Adult 2-3-1, Araimachi, Araimachi, Takasago-shi, Hyogo Prefecture No. Kobe Steel, Ltd. Takasago Works (72) Inventor Takayuki Sato 2-3-1, Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Kobe Steel Works, Takasago Works

Claims (2)

[Claims] 1. An induction heating body and an unvulcanized rubber are arranged on the inner peripheral side of an annular induction coil, and the induction heating body is subjected to electromagnetic induction heating by a magnetic field generated by the induction coil, whereby the unheated body is heated. An unvulcanized rubber heating device for heating vulcanized rubber, wherein at least a part of the induction coil is formed so as to have an open end at a position close to the induction heating body while surrounding the induction coil from an outer peripheral side to an inner peripheral side, An unvulcanized rubber heating device comprising: a magnetic field transfer means for collecting a magnetic field generated around an induction coil without generating an eddy current and generating the magnetic field from the open end. 2. The magnetic field transfer means includes a laminated member formed by laminating silicon steel plates such that each of the silicon steel plates is parallel to a magnetic field direction.
An unvulcanized rubber heating device as described.